NIKITIN, N. S. Dr. — Dept. of Embryol., Leningrad State Univ., Mendeleevsky St. 5, 



LENINGRAD V-164, U.S.S.R. 

 a Morphogenetic potentiality of somatic cells. Ephydatia fluviatilis (Porifera) 

 b Separation of different cell types (centrifugation. filtration, micro-manipulation). 



(Porifera) 

 c Development of culture media for dissociated cells. (Porifera) 

 NIKITINA, Mrs. L. A. Cand.biol.sci. — Inst, of Developm. Biol., Acad, of Sci. of the 



U.S.S.R., Vavilov St. 26, MOSCOW 117133, U.S.S.R. 

 a Analysis of developmental potencies of nuclei in sequential stages of oogenesis by means 



of their transplantation into enucleated eggs (Acipensecidae, Chondrostei; Amphibia) 

 b The influence of fractionated homogenates of some differentiating tissues (retina, muscle) 



on the differentiation of future ectoderm in uncleaved eggs and early stages of cleavage. 



Triturus taeniatus (Urodela), Xenopus laevis (Anura), Gallus domesticus (Aves) (with 



G. V. LOPASHOV) 

 NILSSON, J. R. Dr. — Biol. Inst., Carlsberg Found., 16 Tagensvej, DK 2200 COPEN- 

 HAGEN N, Denmark 

 a Electron microscopy of cell regeneration after short exposure to unfavourable conditions. 



Tetrahymena pyriformis (Ciliata) 

 NISHIMURA, H. M.D., Prof. — Dept. of Anat, Kyoto Univ., Konoe-cho, Yoshida, Sakyo- 



ku, KYOTO 606, Japan • 



a Tests on drug teratogenicity. Macaca fuscata (Primates) 

 b Anomalies in early embryos and maternal factors. Homo sapiens (Primates) 

 c Maternal-embryonic transfer of some drugs and environmental toxicants. Homo sapiens 



(Primates) 

 NISHIOKA, Miss M. D.Sc. — Lab. of Amphib. Biol., Fac. of Sci., Hiroshima Univ., 



Higashisenda-cho, HIROSHIMA, Japan 

 a Synthesis of amphidiploids. (Ranidae, Anura) 



b Synthesis of nucleo-cytoplasmic hybrids between different species. (Ranidae, Anura) 

 NISHIZU, K. — Embryol. Sect., Dept. of Biol., Tokyo Metropolitan Univ., 2-1-1 chome, 



Fukazawa-machi, Setagaya-ku, TOKYO 158, Japan 

 a Myotube formation in cultured cells. Gallus domesticus (Aves) 



NIU M. C. Ph.D., Prof. — Dept. of Biol., Temple Univ., Broad and Berks St., PHILADEL- 

 PHIA. Pa. 19122, U.S.A. • 

 NIXON, D. A. Ph.D. — Physiol. Dept., St.Mary's Hosp. Med. School, Paddington, 



LONDON W.2, England 

 a Perfusion of the isolated foetus. Ovis aries (Artiodactyla) 

 b Development of renal function. Of is an'es (Artiodactyla) 

 c Endocrinology of the foetus. Ovis aries (Artiodactyla) 

 d Metabolism of the placenta and the foetus. Ovis aries (Artiodactyla) 

 NOACK, W. Dr. — II. Anat. Inst, der Freien Univ. Berlin, Kon.-Luise-Str. 15, 1 BERLIN 



33, W.Germany 

 a Development and experimental teratology of lung and muscles. Rattus spec, Mus 



musculus (Rodentia) 

 NODA, Y. D. Ph.D., Prof. — Biol. Inst., Ehime Univ., Bunkyo-cho, MATSUYAMA, 790 



Japan 

 a Ultrastructural changes during fertilization in vitro. Mesocricetus auratus, Mus 



musculus, Rattus spec. (Rodentia) 

 b Fertilization. Nereis spec. (Polychaeta), Urechis spec. (Echiuroidea; Echinoidea) 

 NOGAMI, H. M.D. — Dept. of Orthopaedic Surg., School of Med., Nagoya Univ., 65 



Tsuruma-cho, Showa-ku, NAGOYA, Japan 

 a Induction, origin, and development of bone and cartilage cells (implantation, explantation). 



Rattus spec, Mus musculus (Rodentia) 

 NONAMI, Y. Dr.Agric, Prof. — Dept. of Biochem. and Technol. of Anim. Products, Univ. 



of Niigata, 106, Koganecho, NIIGATA, 950 Japan 

 NOODfiN, L. D. Ph.D., Prof. — Dept. of Bot., Univ. of Michigan, ANN ARBOR, Mich. 



48104, U.S.A. 

 a Molecular mechanisms of regulation: 1. mechanism of action of maleic hydrazide; 2. control 



of gene expression by proteins associated with DNA. (Plantae) 

 NORD, L. M.D. — Tornblad-Inst. for Comp. Embryol., Biskopsgatan 7, S 223 62 LUND, 



Sweden 

 a Primary induction and brain differentiation studied with immunofluorescence. Gallus 



domesticus (Aves) 

 NORMAN, C. Ph.D., Prof. — Dept. of Biol., West Virginia Univ.. MORGANTOWN, 



W.Va. 26506, U.S.A. 

 a The intracellular distribution of sulfhydryl groups in embryonic, adult, and tumorous 



tissues. Rana pipiens (Anura) 

 b Effects of pH on the metabolism and fertilizing capacity of spermatozoa cultured i n 



vitro. (Mammalia) 

 c Effects of light on spermatozoa. (Mammalia) 

 d Physiology and biochemistry of germ cells. (Mammalia) 

 e Physiological and biochemical basis of cell senescence. 



